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        <h1><a href="index.html">All files</a> chapter.js</h1>
        <div class='clearfix'>
            
            <div class='fl pad1y space-right2'>
                <span class="strong">4.41% </span>
                <span class="quiet">Statements</span>
                <span class='fraction'>6/136</span>
            </div>
        
            
            <div class='fl pad1y space-right2'>
                <span class="strong">0% </span>
                <span class="quiet">Branches</span>
                <span class='fraction'>0/40</span>
            </div>
        
            
            <div class='fl pad1y space-right2'>
                <span class="strong">5.88% </span>
                <span class="quiet">Functions</span>
                <span class='fraction'>1/17</span>
            </div>
        
            
            <div class='fl pad1y space-right2'>
                <span class="strong">3.75% </span>
                <span class="quiet">Lines</span>
                <span class='fraction'>5/133</span>
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            Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block.
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    <pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
<a name='L24'></a><a href='#L24'>24</a>
<a name='L25'></a><a href='#L25'>25</a>
<a name='L26'></a><a href='#L26'>26</a>
<a name='L27'></a><a href='#L27'>27</a>
<a name='L28'></a><a href='#L28'>28</a>
<a name='L29'></a><a href='#L29'>29</a>
<a name='L30'></a><a href='#L30'>30</a>
<a name='L31'></a><a href='#L31'>31</a>
<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a>
<a name='L34'></a><a href='#L34'>34</a>
<a name='L35'></a><a href='#L35'>35</a>
<a name='L36'></a><a href='#L36'>36</a>
<a name='L37'></a><a href='#L37'>37</a>
<a name='L38'></a><a href='#L38'>38</a>
<a name='L39'></a><a href='#L39'>39</a>
<a name='L40'></a><a href='#L40'>40</a>
<a name='L41'></a><a href='#L41'>41</a>
<a name='L42'></a><a href='#L42'>42</a>
<a name='L43'></a><a href='#L43'>43</a>
<a name='L44'></a><a href='#L44'>44</a>
<a name='L45'></a><a href='#L45'>45</a>
<a name='L46'></a><a href='#L46'>46</a>
<a name='L47'></a><a href='#L47'>47</a>
<a name='L48'></a><a href='#L48'>48</a>
<a name='L49'></a><a href='#L49'>49</a>
<a name='L50'></a><a href='#L50'>50</a>
<a name='L51'></a><a href='#L51'>51</a>
<a name='L52'></a><a href='#L52'>52</a>
<a name='L53'></a><a href='#L53'>53</a>
<a name='L54'></a><a href='#L54'>54</a>
<a name='L55'></a><a href='#L55'>55</a>
<a name='L56'></a><a href='#L56'>56</a>
<a name='L57'></a><a href='#L57'>57</a>
<a name='L58'></a><a href='#L58'>58</a>
<a name='L59'></a><a href='#L59'>59</a>
<a name='L60'></a><a href='#L60'>60</a>
<a name='L61'></a><a href='#L61'>61</a>
<a name='L62'></a><a href='#L62'>62</a>
<a name='L63'></a><a href='#L63'>63</a>
<a name='L64'></a><a href='#L64'>64</a>
<a name='L65'></a><a href='#L65'>65</a>
<a name='L66'></a><a href='#L66'>66</a>
<a name='L67'></a><a href='#L67'>67</a>
<a name='L68'></a><a href='#L68'>68</a>
<a name='L69'></a><a href='#L69'>69</a>
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<a name='L73'></a><a href='#L73'>73</a>
<a name='L74'></a><a href='#L74'>74</a>
<a name='L75'></a><a href='#L75'>75</a>
<a name='L76'></a><a href='#L76'>76</a>
<a name='L77'></a><a href='#L77'>77</a>
<a name='L78'></a><a href='#L78'>78</a>
<a name='L79'></a><a href='#L79'>79</a>
<a name='L80'></a><a href='#L80'>80</a>
<a name='L81'></a><a href='#L81'>81</a>
<a name='L82'></a><a href='#L82'>82</a>
<a name='L83'></a><a href='#L83'>83</a>
<a name='L84'></a><a href='#L84'>84</a>
<a name='L85'></a><a href='#L85'>85</a>
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<a name='L108'></a><a href='#L108'>108</a>
<a name='L109'></a><a href='#L109'>109</a>
<a name='L110'></a><a href='#L110'>110</a>
<a name='L111'></a><a href='#L111'>111</a>
<a name='L112'></a><a href='#L112'>112</a>
<a name='L113'></a><a href='#L113'>113</a>
<a name='L114'></a><a href='#L114'>114</a>
<a name='L115'></a><a href='#L115'>115</a>
<a name='L116'></a><a href='#L116'>116</a>
<a name='L117'></a><a href='#L117'>117</a>
<a name='L118'></a><a href='#L118'>118</a>
<a name='L119'></a><a href='#L119'>119</a>
<a name='L120'></a><a href='#L120'>120</a>
<a name='L121'></a><a href='#L121'>121</a>
<a name='L122'></a><a href='#L122'>122</a>
<a name='L123'></a><a href='#L123'>123</a>
<a name='L124'></a><a href='#L124'>124</a>
<a name='L125'></a><a href='#L125'>125</a>
<a name='L126'></a><a href='#L126'>126</a>
<a name='L127'></a><a href='#L127'>127</a>
<a name='L128'></a><a href='#L128'>128</a>
<a name='L129'></a><a href='#L129'>129</a>
<a name='L130'></a><a href='#L130'>130</a>
<a name='L131'></a><a href='#L131'>131</a>
<a name='L132'></a><a href='#L132'>132</a>
<a name='L133'></a><a href='#L133'>133</a>
<a name='L134'></a><a href='#L134'>134</a>
<a name='L135'></a><a href='#L135'>135</a>
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<a name='L162'></a><a href='#L162'>162</a>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">export function generateRandomString(length) {
    const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    let result = '';
    for (let i = 0; i &lt; length; i++) {
        result += characters.charAt(Math.floor(Math.random() * characters.length));
    }
    return result;
}
//助教权限检查
async function <span class="fstat-no" title="function not covered" >checkTutorPermission(</span>tutorId, courseCode) {
    const response = <span class="cstat-no" title="statement not covered" >await fetch(`/check-tutor-permission?tutor_id=${tutorId}&amp;course_code=${courseCode}`);</span>
    const data = <span class="cstat-no" title="statement not covered" >await response.json();</span>
<span class="cstat-no" title="statement not covered" >    return data.hasPermission;</span>
}
&nbsp;
// 生成唯一的章节编号
export async function <span class="fstat-no" title="function not covered" >generateUniqueChapterId(</span>) {
    let chapterId;
    let isUnique = <span class="cstat-no" title="statement not covered" >false;</span>
<span class="cstat-no" title="statement not covered" >    while (!isUnique) {</span>
<span class="cstat-no" title="statement not covered" >        chapterId = generateRandomString(50);</span>
        const checkResponse = <span class="cstat-no" title="statement not covered" >await fetch(`/check-chapter-code?chapterId=${chapterId}`);</span>
        const checkData = <span class="cstat-no" title="statement not covered" >await checkResponse.json();</span>
<span class="cstat-no" title="statement not covered" >        if (!checkData.exists) {</span>
<span class="cstat-no" title="statement not covered" >            isUnique = true;</span>
        }
    }
<span class="cstat-no" title="statement not covered" >    return chapterId;</span>
}
&nbsp;
// 检查章节标题是否重复
export async function <span class="fstat-no" title="function not covered" >isChapterTitleDuplicate(</span>courseCode, chapterTitle) {
    const response = <span class="cstat-no" title="statement not covered" >await fetch(`/check-chapter-title?courseCode=${courseCode}&amp;chapterTitle=${chapterTitle}`);</span>
    const data = <span class="cstat-no" title="statement not covered" >await response.json();</span>
<span class="cstat-no" title="statement not covered" >    return data.exists;</span>
}
&nbsp;
// 在checkRoleAndAddChapter函数中添加位置选择逻辑
export async function <span class="fstat-no" title="function not covered" >checkRoleAndAddChapter(</span>courseCode, teacherUserId) {
    const urlParams = <span class="cstat-no" title="statement not covered" >new URLSearchParams(window.location.search);</span>
    const username = <span class="cstat-no" title="statement not covered" >urlParams.get('username');</span>
    const response = <span class="cstat-no" title="statement not covered" >await fetch(`/user-info?username=${username}`);</span>
    const data = <span class="cstat-no" title="statement not covered" >await response.json();</span>
    
<span class="cstat-no" title="statement not covered" >    if (data.role === '教师') {</span>
<span class="cstat-no" title="statement not covered" >        if (data.user_id == teacherUserId) {</span>
            // 获取当前章节列表
            const chaptersResponse = <span class="cstat-no" title="statement not covered" >await fetch(`/get-chapters?courseCode=${courseCode}`);</span>
            const chapters = <span class="cstat-no" title="statement not covered" >await chaptersResponse.json();</span>
            
            // 填充位置选择框
            const positionSelect = <span class="cstat-no" title="statement not covered" >document.getElementById('chapterPosition');</span>
<span class="cstat-no" title="statement not covered" >            positionSelect.innerHTML = '';</span>
            const maxOrder = <span class="cstat-no" title="statement not covered" >chapters.length &gt; 0 ? </span>
                Math.max(...chapters.map(<span class="fstat-no" title="function not covered" >c </span>=&gt; <span class="cstat-no" title="statement not covered" >c.chapter_order)</span>) : -1;
            
            // 添加选项
<span class="cstat-no" title="statement not covered" >            for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i &lt;= maxOrder + 1; i++) {</span>
                const option = <span class="cstat-no" title="statement not covered" >document.createElement('option');</span>
<span class="cstat-no" title="statement not covered" >                option.value = i;</span>
<span class="cstat-no" title="statement not covered" >                option.textContent = `第${i + 1}章`;</span>
<span class="cstat-no" title="statement not covered" >                positionSelect.appendChild(option);</span>
            }
            
<span class="cstat-no" title="statement not covered" >            document.getElementById('courseCodeForChapter').value = courseCode;</span>
<span class="cstat-no" title="statement not covered" >            document.getElementById('addChapterModal').style.display = 'block';</span>
        } else {
<span class="cstat-no" title="statement not covered" >            alert('你无法对不属于你的课程进行该操作');</span>
        }
    } else <span class="cstat-no" title="statement not covered" >if(data.role === '助教' &amp;&amp; await checkTutorPermission(data.user_id, courseCode)){</span>
        // 同上逻辑
        const chaptersResponse = <span class="cstat-no" title="statement not covered" >await fetch(`/get-chapters?courseCode=${courseCode}`);</span>
        const chapters = <span class="cstat-no" title="statement not covered" >await chaptersResponse.json();</span>
        
        const positionSelect = <span class="cstat-no" title="statement not covered" >document.getElementById('chapterPosition');</span>
<span class="cstat-no" title="statement not covered" >        positionSelect.innerHTML = '';</span>
        const maxOrder = <span class="cstat-no" title="statement not covered" >chapters.length &gt; 0 ? </span>
            Math.max(...chapters.map(<span class="fstat-no" title="function not covered" >c </span>=&gt; <span class="cstat-no" title="statement not covered" >c.chapter_order)</span>) : -1;
        
<span class="cstat-no" title="statement not covered" >        for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i &lt;= maxOrder + 1; i++) {</span>
            const option = <span class="cstat-no" title="statement not covered" >document.createElement('option');</span>
<span class="cstat-no" title="statement not covered" >            option.value = i;</span>
<span class="cstat-no" title="statement not covered" >            option.textContent = `第${i + 1}章`;</span>
<span class="cstat-no" title="statement not covered" >            positionSelect.appendChild(option);</span>
        }
        
<span class="cstat-no" title="statement not covered" >        document.getElementById('courseCodeForChapter').value = courseCode;</span>
<span class="cstat-no" title="statement not covered" >        document.getElementById('addChapterModal').style.display = 'block';</span>
    }
}
&nbsp;
// 修改addNewChapter函数以包含章节位置
export async function <span class="fstat-no" title="function not covered" >addNewChapter(</span>) {
    const chapterTitle = <span class="cstat-no" title="statement not covered" >document.getElementById('chapterTitle').value;</span>
    const chapterContent = <span class="cstat-no" title="statement not covered" >document.getElementById('chapterContent').value;</span>
    const courseCode = <span class="cstat-no" title="statement not covered" >document.getElementById('courseCodeForChapter').value;</span>
    const chapterOrder = <span class="cstat-no" title="statement not covered" >document.getElementById('chapterPosition').value;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (!chapterTitle || !chapterContent) {</span>
<span class="cstat-no" title="statement not covered" >        alert('章节信息不合法');</span>
<span class="cstat-no" title="statement not covered" >        return;</span>
    }
<span class="cstat-no" title="statement not covered" >    if(chapterTitle&gt;25){</span>
<span class="cstat-no" title="statement not covered" >        alert('章节名称不能超过25个字符');</span>
<span class="cstat-no" title="statement not covered" >        return;</span>
    }
<span class="cstat-no" title="statement not covered" >       if(chapterContent&gt;100){</span>
<span class="cstat-no" title="statement not covered" >        alert('章节内容不能超过100个字符');</span>
<span class="cstat-no" title="statement not covered" >        return;</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (await isChapterTitleDuplicate(courseCode, chapterTitle)) {</span>
<span class="cstat-no" title="statement not covered" >        alert('章节标题已存在');</span>
<span class="cstat-no" title="statement not covered" >        return;</span>
    }
&nbsp;
    const chapterId = <span class="cstat-no" title="statement not covered" >await generateUniqueChapterId();</span>
&nbsp;
    const response = <span class="cstat-no" title="statement not covered" >await fetch('/add-chapter', {</span>
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({
            chapter_id: chapterId,
            chapter_title: chapterTitle,
            chapter_content: chapterContent,
            course_code: courseCode,
            chapter_order: chapterOrder
        })
    });
    const result = <span class="cstat-no" title="statement not covered" >await response.json();</span>
<span class="cstat-no" title="statement not covered" >    alert(result.message);</span>
<span class="cstat-no" title="statement not covered" >    closeAddChapterModal();</span>
    // 刷新页面或更新UI
<span class="cstat-no" title="statement not covered" >    window.location.reload();</span>
}
&nbsp;
// 关闭新增章节模态框
export function <span class="fstat-no" title="function not covered" >closeAddChapterModal(</span>) {
<span class="cstat-no" title="statement not covered" >    document.getElementById('addChapterModal').style.display = 'none';</span>
}
&nbsp;
// 检查角色并删除章节
export async function <span class="fstat-no" title="function not covered" >checkRoleAndDeleteChapter(</span>courseCode, teacherUserId) {
    const urlParams = <span class="cstat-no" title="statement not covered" >new URLSearchParams(window.location.search);</span>
    const username = <span class="cstat-no" title="statement not covered" >urlParams.get('username');</span>
    const response = <span class="cstat-no" title="statement not covered" >await fetch(`/user-info?username=${username}`);</span>
    const data = <span class="cstat-no" title="statement not covered" >await response.json();</span>
<span class="cstat-no" title="statement not covered" >    if (data.role === '教师') {</span>
<span class="cstat-no" title="statement not covered" >        if (data.user_id == teacherUserId) {</span>
            const chaptersResponse = <span class="cstat-no" title="statement not covered" >await fetch(`/get-chapters?courseCode=${courseCode}`);</span>
            const chapters = <span class="cstat-no" title="statement not covered" >await chaptersResponse.json();</span>
<span class="cstat-no" title="statement not covered" >            if (chapters.length === 0) {</span>
<span class="cstat-no" title="statement not covered" >                alert('该课程暂无章节，无法删除');</span>
<span class="cstat-no" title="statement not covered" >                return;</span>
            }
            // 填充选择框
            const deleteChapterSelect = <span class="cstat-no" title="statement not covered" >document.getElementById('deleteChapterSelect');</span>
<span class="cstat-no" title="statement not covered" >            deleteChapterSelect.innerHTML = '';</span>
<span class="cstat-no" title="statement not covered" >            chapters.forEach(<span class="fstat-no" title="function not covered" >ch</span>apter =&gt; {</span>
                const option = <span class="cstat-no" title="statement not covered" >document.createElement('option');</span>
<span class="cstat-no" title="statement not covered" >                option.value = chapter.chapter_id;</span>
<span class="cstat-no" title="statement not covered" >                option.textContent = `第${chapter.chapter_order + 1}章 ${chapter.chapter_title}`;</span>
<span class="cstat-no" title="statement not covered" >                deleteChapterSelect.appendChild(option);</span>
            });
<span class="cstat-no" title="statement not covered" >            document.getElementById('deleteChapterModal').style.display = 'block';</span>
        } else {
<span class="cstat-no" title="statement not covered" >            alert('你无法对不属于你的课程进行该操作');</span>
        }
    } else <span class="cstat-no" title="statement not covered" >if(data.role === '助教' &amp;&amp; await checkTutorPermission(data.user_id, courseCode)){</span>
            const chaptersResponse = <span class="cstat-no" title="statement not covered" >await fetch(`/get-chapters?courseCode=${courseCode}`);</span>
            const chapters = <span class="cstat-no" title="statement not covered" >await chaptersResponse.json();</span>
<span class="cstat-no" title="statement not covered" >            if (chapters.length === 0) {</span>
<span class="cstat-no" title="statement not covered" >                alert('该课程暂无章节，无法删除');</span>
<span class="cstat-no" title="statement not covered" >                return;</span>
            }
            // 填充选择框
            const deleteChapterSelect = <span class="cstat-no" title="statement not covered" >document.getElementById('deleteChapterSelect');</span>
<span class="cstat-no" title="statement not covered" >            deleteChapterSelect.innerHTML = '';</span>
<span class="cstat-no" title="statement not covered" >            chapters.forEach(<span class="fstat-no" title="function not covered" >ch</span>apter =&gt; {</span>
                const option = <span class="cstat-no" title="statement not covered" >document.createElement('option');</span>
<span class="cstat-no" title="statement not covered" >                option.value = chapter.chapter_id;</span>
<span class="cstat-no" title="statement not covered" >                option.textContent = chapter.chapter_title;</span>
<span class="cstat-no" title="statement not covered" >                deleteChapterSelect.appendChild(option);</span>
            });
<span class="cstat-no" title="statement not covered" >            document.getElementById('deleteChapterModal').style.display = 'block';</span>
        }
}
&nbsp;
// 关闭删除章节模态框
export function <span class="fstat-no" title="function not covered" >closeDeleteChapterModal(</span>) {
<span class="cstat-no" title="statement not covered" >    document.getElementById('deleteChapterModal').style.display = 'none';</span>
}
&nbsp;
// 删除章节
export async function <span class="fstat-no" title="function not covered" >deleteChapter(</span>) {
    const deleteChapterSelect = <span class="cstat-no" title="statement not covered" >document.getElementById('deleteChapterSelect');</span>
    const chapterId = <span class="cstat-no" title="statement not covered" >deleteChapterSelect.value;</span>
<span class="cstat-no" title="statement not covered" >    if (!chapterId) {</span>
<span class="cstat-no" title="statement not covered" >        alert('请选择要删除的章节');</span>
<span class="cstat-no" title="statement not covered" >        return;</span>
    }
&nbsp;
    const response = <span class="cstat-no" title="statement not covered" >await fetch(`/delete-chapter?chapterId=${chapterId}`, {</span>
        method: 'DELETE'
    });
    const result = <span class="cstat-no" title="statement not covered" >await response.json();</span>
<span class="cstat-no" title="statement not covered" >    alert(result.message);</span>
<span class="cstat-no" title="statement not covered" >    closeDeleteChapterModal();</span>
}
&nbsp;
// 打开查看章节模态框
export async function <span class="fstat-no" title="function not covered" >openViewChaptersModal(</span>courseCode) {
    const response = <span class="cstat-no" title="statement not covered" >await fetch(`/get-chapters?courseCode=${courseCode}`);</span>
    const chapters = <span class="cstat-no" title="statement not covered" >await response.json();</span>
    const chapterList = <span class="cstat-no" title="statement not covered" >document.getElementById('chapterList');</span>
<span class="cstat-no" title="statement not covered" >    chapterList.innerHTML = '';</span>
<span class="cstat-no" title="statement not covered" >    if (chapters.length === 0) {</span>
<span class="cstat-no" title="statement not covered" >        chapterList.innerHTML = '&lt;p class="no-content-message"&gt;暂无章节&lt;/p&gt;';</span>
    }
<span class="cstat-no" title="statement not covered" >    chapters.forEach(<span class="fstat-no" title="function not covered" >ch</span>apter =&gt; {</span>
        const chapterBox = <span class="cstat-no" title="statement not covered" >document.createElement('div');</span>
<span class="cstat-no" title="statement not covered" >        chapterBox.classList.add('course-box');</span>
<span class="cstat-no" title="statement not covered" >        chapterBox.innerHTML = `</span>
    &lt;div class="chapter-container"&gt;
        &lt;div class="chapter-header"&gt;
            &lt;span class="chapter-badge"&gt;第${chapter.chapter_order + 1}章&lt;/span&gt;
            &lt;h3 class="chapter-title"&gt;${chapter.chapter_title}&lt;/h3&gt;
        &lt;/div&gt;
        
        &lt;div class="chapter-content"&gt;
            &lt;div class="content-header"&gt;
                &lt;i class="fas fa-align-left content-icon"&gt;&lt;/i&gt;
                &lt;h4 class="content-title"&gt;章节内容&lt;/h4&gt;
            &lt;/div&gt;
            &lt;div class="content-text"&gt;${chapter.chapter_content}&lt;/div&gt;
        &lt;/div&gt;
    &lt;/div&gt;
`;
<span class="cstat-no" title="statement not covered" >        chapterList.appendChild(chapterBox);</span>
    });
<span class="cstat-no" title="statement not covered" >    document.getElementById('viewChaptersModal').style.display = 'block';</span>
}
&nbsp;
// 关闭查看章节模态框
export function <span class="fstat-no" title="function not covered" >closeViewChaptersModal(</span>) {
<span class="cstat-no" title="statement not covered" >    document.getElementById('viewChaptersModal').style.display = 'none';</span>
}
    </pre></td></tr></table></pre>

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